The correct statement is that "There is a thin layer of topsoil in tropical rainforests."
This is because the tropical rainforest is characterized by constant rainfall. This leads to eating away of the topsoil in the tropical rainforest, thereby making it thin in texture and content.
Option A is not correct because temperate areas have thickly layered topsoil.
Options B and C are wrong because desserts have sandy soil, which is not humus in anyways.
Hence, in this case, the correct answer is option D. "There is a thin layer of topsoil in tropical rain forests."
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Lake Michigan is the only one of the Great Lakes that is entirely within the United States; the others form a water boundary between the United States and Canada.
The earth's axis points to the same spot in the sky as the earth orbits the sun. This relationship can be divided into four points of interest.
<span>1) When the earth's north pole is pointing at its maximum amount away from the sun. That is the winter solstice in the northern hemisphere. </span>
<span>2) Six months later, the north pole is now tilted most *toward* the sun. This is the NH summer solstice. </span>
<span>3,4) The points halfway between those are where the polar axis is "sideways" to the sun. The sun is on a direct line from the center of the earth through the equator. These are the two equinoxes. </span>
<span>To illustrate this, take a globe and move it in a circle around some central point, with the angle of the polar tilt always pointed in the same direction. </span>